about output impandence!!

[mickey0908]

When simulation the output impandence,
there is a big difference output impandence when use difference static bias current to simulation the output impandence?

I used the OP feedback to increase the output impandence.

 

[FvM]

difference static bias current

??? By definition, a bias current isn't differential.

 

[mickey0908]

Hi FvM,
How to simulate the output impandence of cascode current mirror?
Maybe I used a mistake simulation method.

 

[lllxb]

It should be no surprise to see output resistance variation with biasing current variation, since both ro and gm of MOS are stongly current dependant.